← single night · whole-night plan
Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.
| night of | astronomy | weather | overall | best window | highest | dark h | Moon | Moon sep. |
|---|---|---|---|---|---|---|---|---|
| 2026-01-13 Tue | 92 | 13 | 12 | 01:40–02:00 (marginal, 0.33 h) | 50.2° 05:15 | 11.27 | 21% | 54.4° |
| 2026-01-14 Wed | 93 | 100 | 93 | 01:25–06:10 (good, 4.75 h) | 50.2° 05:15 | 11.25 | 14% | 66.1° |
| 2026-01-15 Thu | 93 | 79 | 74 | 01:25–05:00 (good, 3.58 h) | 50.2° 05:10 | 11.23 | 8% | 78.0° |
| 2026-01-16 Fri | 93 | 0 | 0 | — | 50.2° 05:05 | 11.2 | 4% | 89.9° |
| 2026-01-17 Sat | 93 | 1 | 1 | — | 50.2° 05:00 | 11.18 | 1% | 102.1° |
| 2026-01-18 Sun | 93 | 0 | 0 | — | 50.2° 04:55 | 11.16 | 0% | 114.4° |
| 2026-01-19 Mon | 93 | 98 | 91 | 01:15–06:10 (good, 4.92 h) | 50.2° 04:55 | 11.13 | 1% | 126.9° |
| 2026-01-20 Tue | 93 | 5 | 5 | — | 50.2° 04:50 | 11.11 | 5% | 139.6° |
| 2026-01-21 Wed | 93 | 0 | 0 | — | 50.2° 04:45 | 11.08 | 10% | 152.3° |
| 2026-01-22 Thu | 93 | 0 | 0 | — | 50.2° 04:40 | 11.06 | 17% | 164.7° |
| 2026-01-23 Fri | 93 | 48 | 45 | 02:00–04:00 (good, 2.0 h) | 50.2° 04:40 | 11.03 | 26% | 172.9° |
| 2026-01-24 Sat | 93 | 0 | 0 | — | 50.2° 04:35 | 11.0 | 36% | 164.8° |
| 2026-01-25 Sun | 93 | 0 | 0 | — | 50.2° 04:30 | 10.97 | 47% | 151.9° |
| 2026-01-26 Mon | 93 | 0 | 0 | — | 50.2° 04:25 | 10.94 | 58% | 138.1° |
| 2026-01-27 Tue | 93 | 8 | 7 | 06:00–06:05 (marginal, 0.08 h) | 50.2° 04:20 | 10.91 | 69% | 124.1° |
| 2026-01-28 Wed | 93 | 0 | 0 | — | 50.2° 04:20 | 10.88 | 80% | 109.8° |
| 2026-01-29 Thu | 90 | 0 | 0 | — | 50.2° 04:15 | 10.85 | 88% | 95.4° |
| 2026-01-30 Fri | 65 | 0 | 0 | — | 50.2° 04:10 | 10.82 | 95% | 81.0° |
| 2026-01-31 Sat | 47 | 0 | 0 | — | 50.2° 04:05 | 10.79 | 99% | 66.6° |
| 2026-02-01 Sun | 32 | 0 | 0 | — | 50.2° 04:00 | 10.76 | 100% | 52.5° |
| 2026-02-02 Mon | 22 | 0 | 0 | — | 50.2° 04:00 | 10.72 | 99% | 38.7° |
| 2026-02-03 Tue | 19 | 0 | 0 | — | 50.2° 03:55 | 10.69 | 95% | 25.5° |
| 2026-02-04 Wed | 23 | 0 | 0 | — | 50.2° 03:50 | 10.66 | 89% | 13.3° |
| 2026-02-05 Thu | 30 | 0 | 0 | — | 50.2° 03:45 | 10.62 | 82% | 7.3° |
| 2026-02-06 Fri | 42 | 0 | 0 | — | 50.2° 03:45 | 10.59 | 74% | 15.9° |
| 2026-02-07 Sat | 66 | 26 | 17 | 00:00–02:00 (marginal, 2.0 h) | 50.2° 03:40 | 10.55 | 65% | 27.3° |
| 2026-02-08 Sun | 85 | 4 | 3 | 23:55–00:00 (marginal, 0.08 h) | 50.2° 03:35 | 10.51 | 56% | 39.0° |
| 2026-02-09 Mon | 91 | 0 | 0 | — | 50.2° 03:30 | 10.48 | 46% | 50.7° |
| 2026-02-10 Tue | 93 | 0 | 0 | — | 50.2° 03:25 | 10.44 | 37% | 62.4° |
| 2026-02-11 Wed | 93 | 0 | 0 | — | 50.2° 03:25 | 10.4 | 28% | 74.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-01-13&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csvOne row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.